♻️ Restructure: Move Astro to repository root

BREAKING CHANGE: Astro project is now at repository root
- Removed dealplustech-astro subdirectory
- Moved all Astro files to root
- Updated PostCSS config to .cjs
- Removed old Next.js files

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Migration path:
- Old structure: /dealplustech-astro/
- New structure: / (root)

dealplustech-astro/node_modules/astro/dist/preferences/index.d.ts

@@ -1,36 +0,0 @@
-import type { AstroConfig } from '../types/public/config.js';
-import { type Preferences, type PublicPreferences } from './defaults.js';
-type DotKeys<T> = T extends object ? {
-    [K in keyof T]: `${Exclude<K, symbol>}${DotKeys<T[K]> extends never ? '' : `.${DotKeys<T[K]>}`}`;
-}[keyof T] : never;
-type GetDotKey<T extends Record<string | number, any>, K extends string> = K extends `${infer U}.${infer Rest}` ? GetDotKey<T[U], Rest> : T[K];
-type PreferenceLocation = 'global' | 'project';
-interface PreferenceOptions {
-    location?: PreferenceLocation;
-    /**
-     * If `true`, the server will be reloaded after setting the preference.
-     * If `false`, the server will not be reloaded after setting the preference.
-     *
-     * Defaults to `true`.
-     */
-    reloadServer?: boolean;
-}
-type DeepPartial<T> = T extends object ? {
-    [P in keyof T]?: DeepPartial<T[P]>;
-} : T;
-export type PreferenceKey = DotKeys<Preferences>;
-interface PreferenceList extends Record<PreferenceLocation, DeepPartial<PublicPreferences>> {
-    fromAstroConfig: DeepPartial<Preferences>;
-    defaults: PublicPreferences;
-}
-export interface AstroPreferences {
-    get<Key extends PreferenceKey>(key: Key, opts?: PreferenceOptions): Promise<GetDotKey<Preferences, Key>>;
-    set<Key extends PreferenceKey>(key: Key, value: GetDotKey<Preferences, Key>, opts?: PreferenceOptions): Promise<void>;
-    getAll(): Promise<PublicPreferences>;
-    list(opts?: PreferenceOptions): Promise<PreferenceList>;
-    ignoreNextPreferenceReload: boolean;
-}
-export declare function isValidKey(key: string): key is PreferenceKey;
-export declare function coerce(key: string, value: unknown): any;
-export default function createPreferences(config: AstroConfig, dotAstroDir: URL): AstroPreferences;
-export {};